100 lines
3.6 KiB
Plaintext
100 lines
3.6 KiB
Plaintext
Shader "Hidden/HDRP/GGXConvolve"
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{
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SubShader
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{
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Tags{ "RenderPipeline" = "HDRenderPipeline" }
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Pass
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{
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Cull Off
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ZTest Always
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ZWrite Off
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Blend Off
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HLSLPROGRAM
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#pragma editor_sync_compilation
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#pragma target 4.5
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#pragma only_renderers d3d11 playstation xboxone xboxseries vulkan metal switch
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#pragma multi_compile _ USE_MIS
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#pragma vertex Vert
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#pragma fragment Frag
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl"
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/ImageBasedLighting.hlsl"
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Material/GGXConvolution/GGXConvolution.cs.hlsl"
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SAMPLER(s_trilinear_clamp_sampler);
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TEXTURECUBE(_MainTex);
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TEXTURE2D(_GgxIblSamples);
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#ifdef USE_MIS
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TEXTURE2D(_MarginalRowDensities);
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TEXTURE2D(_ConditionalDensities);
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#endif
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float _Level;
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float _InvOmegaP;
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float4x4 _PixelCoordToViewDirWS; // Actually just 3x3, but Unity can only set 4x4
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struct Attributes
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{
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uint vertexID : SV_VertexID;
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};
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struct Varyings
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{
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float4 positionCS : SV_POSITION;
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};
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Varyings Vert(Attributes input)
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{
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Varyings output;
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output.positionCS = GetFullScreenTriangleVertexPosition(input.vertexID);
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return output;
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}
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float4 Frag(Varyings input) : SV_Target
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{
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// Points towards the camera
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float3 viewDirWS = normalize(mul(float3(input.positionCS.xy, 1.0), (float3x3)_PixelCoordToViewDirWS));
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// Reverse it to point into the scene
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float3 N = -viewDirWS;
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// Remove view-dependency from GGX, effectively making the BSDF isotropic.
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float3 V = N;
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float perceptualRoughness = MipmapLevelToPerceptualRoughness(_Level);
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float roughness = PerceptualRoughnessToRoughness(perceptualRoughness);
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uint sampleCount = GetIBLRuntimeFilterSampleCount(_Level);
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#ifdef USE_MIS
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float4 val = IntegrateLD_MIS(TEXTURECUBE_ARGS(_MainTex, s_trilinear_clamp_sampler),
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_MarginalRowDensities, _ConditionalDensities,
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V, N,
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roughness,
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_InvOmegaP,
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LIGHTSAMPLINGPARAMETERS_TEXTURE_WIDTH,
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LIGHTSAMPLINGPARAMETERS_TEXTURE_HEIGHT,
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1024,
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false);
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#else
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float4 val = IntegrateLD(TEXTURECUBE_ARGS(_MainTex, s_trilinear_clamp_sampler),
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_GgxIblSamples,
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V, N,
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roughness,
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_Level - 1,
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_InvOmegaP,
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sampleCount, // Must be a Fibonacci number
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true,
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true);
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#endif
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return val;
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}
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ENDHLSL
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}
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}
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}
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